The spin-only magnetic moment of $[MnBr_4]^{2-}$ is $5.9 \ BM$. Predict the geometry of the complex ion.

The number of isoelectronic species among $Sc^{3+}$,$Cr^{2+}$,$Mn^{3+}$,$Co^{3+}$,and $Fe^{3+}$ is $n$. If $n$ moles of $AgCl$ are formed during the reaction of the complex with the formula $CoCl_{3}(en)_{2}NH_{3}$ with excess $AgNO_{3}$,then the number of electrons present in the $t_{2g}$ orbital of the complex is . . . . . . .

Identify the correct set for the $[Co(NH_3)_6]^{3+}$ ion regarding the hybridization of $Co^{3+}$,type of complex,and the number of unpaired electrons in the complex ion,respectively.

Which of the following has the maximum number of unpaired electrons?

Which of the following is an incorrect pair?

Complexes $(ML_5)$ of metals $Ni$ and $Fe$ have ideal square pyramidal and trigonal bipyramidal geometries,respectively. The sum of the $90^{\circ}$,$120^{\circ}$ and $180^{\circ}$ $L-M-L$ angles in the two complexes is